diff --git a/src/token/cose/crypto_impl/openssl/encrypt.rs b/src/token/cose/crypto_impl/openssl/encrypt.rs
index 5e04209..1fac49f 100644
--- a/src/token/cose/crypto_impl/openssl/encrypt.rs
+++ b/src/token/cose/crypto_impl/openssl/encrypt.rs
@@ -1,3 +1,14 @@
+/*
+ * Copyright (c) 2022-2024 The NAMIB Project Developers.
+ * Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+ * https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+ * <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+ * option. This file may not be copied, modified, or distributed
+ * except according to those terms.
+ *
+ * SPDX-License-Identifier: MIT OR Apache-2.0
+ */
+
 use crate::error::CoseCipherError;
 use crate::token::cose::crypto_impl::openssl::OpensslContext;
 use crate::token::cose::util::{aes_ccm_algorithm_tag_len, AES_GCM_TAG_LEN};
diff --git a/src/token/cose/crypto_impl/openssl/key_distribution.rs b/src/token/cose/crypto_impl/openssl/key_distribution.rs
index 958d9ff..173b5c8 100644
--- a/src/token/cose/crypto_impl/openssl/key_distribution.rs
+++ b/src/token/cose/crypto_impl/openssl/key_distribution.rs
@@ -1,3 +1,14 @@
+/*
+ * Copyright (c) 2022-2024 The NAMIB Project Developers.
+ * Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+ * https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+ * <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+ * option. This file may not be copied, modified, or distributed
+ * except according to those terms.
+ *
+ * SPDX-License-Identifier: MIT OR Apache-2.0
+ */
+
 use crate::error::CoseCipherError;
 use crate::token::cose::crypto_impl::openssl::OpensslContext;
 use crate::token::cose::{CoseSymmetricKey, HeaderParam, KeyDistributionCryptoBackend};
diff --git a/src/token/cose/crypto_impl/openssl/mac.rs b/src/token/cose/crypto_impl/openssl/mac.rs
index 0d2ed9c..2734b62 100644
--- a/src/token/cose/crypto_impl/openssl/mac.rs
+++ b/src/token/cose/crypto_impl/openssl/mac.rs
@@ -1,3 +1,14 @@
+/*
+ * Copyright (c) 2022-2024 The NAMIB Project Developers.
+ * Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+ * https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+ * <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+ * option. This file may not be copied, modified, or distributed
+ * except according to those terms.
+ *
+ * SPDX-License-Identifier: MIT OR Apache-2.0
+ */
+
 use crate::error::CoseCipherError;
 use crate::token::cose::crypto_impl::openssl::{CoseOpensslCipherError, OpensslContext};
 use crate::token::cose::{crypto_impl, CoseSymmetricKey, MacCryptoBackend};
diff --git a/src/token/cose/crypto_impl/openssl/sign.rs b/src/token/cose/crypto_impl/openssl/sign.rs
index 99501b7..2a79e98 100644
--- a/src/token/cose/crypto_impl/openssl/sign.rs
+++ b/src/token/cose/crypto_impl/openssl/sign.rs
@@ -1,3 +1,14 @@
+/*
+ * Copyright (c) 2022-2024 The NAMIB Project Developers.
+ * Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+ * https://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+ * <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your
+ * option. This file may not be copied, modified, or distributed
+ * except according to those terms.
+ *
+ * SPDX-License-Identifier: MIT OR Apache-2.0
+ */
+
 use crate::error::CoseCipherError;
 use crate::token::cose::crypto_impl::openssl::{CoseOpensslCipherError, OpensslContext};
 use crate::token::cose::{CoseEc2Key, EllipticCurve};